Piston and piston ring



Dec. 25,1923. 1 1,478.56?

M. AESSEL PISTON AND PISTON RING Filed March 2. 1921 gar MM Patented Dec. 25, 1923.

UNITED STATES PATENT GFFICE- IICEAEL FAESSEL, OF SEATTLE, WASHINGTON, ASSIGNOR, BY DIRECT AND MEBNE ASSIGNMENTS, T LOXON PISTON AND RING- COKPANY, 01'! SEATTLE, WASHING- TON, A CORPORATIONOF WASHINGTON. P

PISTON AND PISTON RING.

Application and March 2, 1921. Serial no. 448,961.

' l0 piston rings and to improvements in the pistons upon which such rings are used and the object of this improvement is to provide a simple and efiicient ring that is constructed and arranged so that it will be pressed out- 16 wardly against the walls of a cylinder by any of the compressed fluid past the 'si It A further object is to 8 away from the walls of the piston fluid pressure exerted against the piston thereby effectively preventing the escape of es of the piston.

rovide a piston ring having a cylindrical throat portion that i adapted to be shrunk onto a piston and dim fixedly secured thereto and having o. flaring mouth portion that is inclined and that is adapted to expand and contract a sumcient amount to keep it always in snug contact with the walls of the cylinder.

A still further object i to provide a piston ring that is made up of two or more members that overlie each other and that are aring mouth portions the flaring mouth portions having lots to permit them to ex pand, the slots in the several members being oflfset with respect to each other.

'With the above and other objects in view as will be apparent from the following description the invention consists. in the novel construction, adaptation and combination of part as will be more clearly hereinafter ing a with my invention; Fig. 2 1s a plan'view described and claimed.

In the accompanying draWingsFigure 1 is a view in side elevation of a piston havpiston ring constructed in accordance "showing the top of the piston and piston ring; Fig. 3 is a View in vertical section substantially on a broken line 3, 3 of Fig. 2,

provided with cylindrical neck portions and 'f will fit accurately,

and Fig. 4 is an enlarged fragmentary sectional view substantially on broken line 4, 4

of Fig. 2.

Like reference numerals designate like part throughout the several views.

Referring to the drawings the numeral 5 designates a piston having a cylindrical upper end 6 that i of smaller diameter than the lower portion of the piston and that terminates in a shoulder 7. The piston 5 is provided with the usual transversely arranged bearings 8 and if desired such iston may be provi ed just below the shou der 7 with a ring cove-10 for the reception of a piston ring 1ot shown) of the usual form.

My piston ring comprises two interfittin members 11 and 12 each having a cylindrica base or throat portion and a flaring upper end or mouth portion, the member 12 being arranged to fit snugly over the outside of the member 11. "The flaring upper end of the innermost member, 11 presents an inclined or frustro-conical surface 13 against which any fluid as steam oigas that is-compressed upon the to end of the cylinder may exert an outwar or lateral pressure.

he outwardly flared portions of the members 11 and 12 terminate at their upper end in a cylindrical wall 14 that bears against the internal wall of the cylinder within which the piston is disposed and that orms a shar edge at its intersection with the wall 13.

The flared portions of the members 11 and 12 are provided with a plurality of slots 15 and 16 respectively that extend from the upper extremities of the flared mouth portions downwardly to their 'unction with the cylindrical neck: portions to thereby render the flared mouth portions more readily capable of expansion and contractionr The abutting surfaces of the two ring members 11 and 12, the inner surface of the cylindrical neck portion of the innermost ring member 11 and the surface 14 thatengages the wall of the cylinder are all preferably ground or machined so that they while the external sur- .of the or linder.

. surroundingthe iron preventin any ossible wobblin 'motion and knee 'ng o the piston. 'en the aluminum pistonbecomes hot it will expand face ofthe outer ring inner surface 13 of t I be left rough.

12 and the inclined e inner ring 11 may The piston ring is permanently secured to the cylinder y shrinking it upon the upper end 6 thereof in the position shown 1n Fig. 3 with'.the bottom of the ring resting .on the shoulder 7 The ring i constructed so thatthe diameter of the cylindrical Wall 14: 1s slightly greater than the internal diameter of the c linder in which the piston is to be usedso that whom the pistonis inserted in the c 11nder the flaring portion of the ring wi l be compressed a slight amount and W111 spring outwardly into. close contact with the walls When compression of fluid occure'above the top end of the piston the lateral thrust due to such compression will press the flared portion of the ring tightly against the wall of the cylinder thereby preventing leakage of compressed fluid past the sides of the piston.

If desired apiston ring of the usual well known type may be placed in the annular ring groove to prevent the passage oi lubricating oil from the crank case upwardly around the sides of the piston.

Ti the piston 5 is constructed of aluminum, which has a high coetiicient of expansion, then thelower ortion of the plston is preferably rovid with a plurahty of d vertica slots and an iron ring 21 is inserted within theslotted portion there-' of, as shown in Fig. 3, so that when the pie ton is cold the'slotted portion of the iston will be owed outwardly (Sr-expanded s ightly as at 22 thereby. preventing excessive clearance between" the walls of the cylinder and thus a greater amount than the iron sing21 and as it expands will tend to. eliminate the bulged rtion,23'a nd assume, a true cylindrical s ape.

0d ,of operation readi'lg If desired. pistons of standard type may be reconstructed to adapt them for the reception of my piston ring-b machining. or turning'the top ends of sue pistons down to the desired smaller. diameter.

This iston ring is si ple in construction, as to install, not ex nsive-to manufacture an is especially efiicient in its operation.

From the foregein'g decription taken in connection with the accompanying drawing the advantages of the construction and met of this piston ring will be apparent, but. while I have describe theprinciple ofoperation of the invention together with the device which I now consi er to be the best embodiment thereof it Wlll be under'stood that the spe- 'cific disclosure ismerely illustrative and thereof, said end shoulder, and a pistdrn in ofmade that such changes may be made as are within the scope and spirit of the inventlon.

What I claim is: I

1. A piston having a cylindrical reduced end portion, a piston ring lncluding two solid rings having outwardly flared upper end portions and cylindrical portions interfitting in concentric relation, the inner ring bein adapted to accurately fit the reduced en of the piston and be permanently secured thereto.

3. A piston having a cylindrical end of smaller diameter than the body thereof, and a piston ring having a flaring mouth portion anda cylindrical throat portion arranged to fit over the smaller end of said piston, the said flaring mouth portion being cut into a plurality of segments by slots that extend from the outer edge inwardly, and said throat portion accurately smaller end of said piston.

4. A piston having a c a cylindrical inner end arranged to fit over the smaller and of'said piston and be permanently secured thereto .and, having a fustroconical outer and provided with an. inner wall that flares outwardly from the sides of the piston and having near its outer'extremity an external cylindrical wall arranged to engage-with the inner walls of a cylinder. 1.

5. A piston having a c lindrical end of smaller diameter than the body portion terminating in an abrupt p of a plurality of overlapping sections, mg a cylindrical throat portion, the end of which abuts said shoulder and a flaring mouth portion, said throat portions being arrange to fit over the smal or end of said piston and the mouth portion of each of said sections having its walls cut by slots that extendfrom the outer end thereof in wardly, the slots in adjacent sections bein sta gered with respect to each other, and sa'i throat ortions being permanently se fitting ,and being permanentiy secured to the ylindrical end as reduced diameter, and a piston ring having lli each hav- V cured to eac other and the smaller end of the piston.

; mg from one end of the throat portion bea cylindrical reduced "its . yond the circumference of the pisgon to enmanently secured thereto, and said flared 10 gage the cylinder wall. v end portions terminating in a cylindrical 7 Apiston having a cylindrical reduced form so that the ends of all the rings will end i ortion and a piston ring including a, en age the cylinder wall.

- gluralry of solid rings havin outwardly Tn witness whereof, I hereunto subscribe ared upper end portions an "cylindrical my name this 24th day of February A; D. i

portions interfit-ting in concentric relation, the inner ringpeingadapted to accurately fit the reduced end of the piston and be per- MICHAEL FAESSEL. 

